JP2003057592A - Picture display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact lens array substrate of high light quantity efficiency which condenses and reflects without loss even in the case of oblique incidence of incident light from a light source. SOLUTION: A double convex lens system is provided, and the focus position of one convex lens part is arranged on the surface of the other convex lens, and such constitution is given that first incident light which is light of parallel rays from a color separation means, principal rays made incident through the focus position, and second incident light made incident in parallel with the principal rays are condensed together within a prescribed effective range on the side of a reflection space modulation element 80, and the reflection space modulation element 80 is provided with a plurality of reflection plates 71 which are arranged in correspondence with to pixels and are constituted so as to be able to properly change the reflection angle of incident light and a reflection plate driving means which drives the reflection plates, and the reflection plates are individually selected in accordance with pixel information to reflect required pixels to the projection lens side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device, and more specifically, a reflection plate corresponding to each pixel with respect to oblique incident light is changed in angle according to display or non-display of each pixel. The present invention relates to an image display device that projects an image.

[0002]

2. Description of the Related Art Recently, as a liquid crystal projector capable of projecting a color image at low cost without using a color filter,
"Single-panel liquid crystal device" in which pixels for arranging color separation images of the three primary colors R, G, B are arranged on one panel
In addition, there is a "single-panel liquid crystal color projector" that displays primary color lights separated by three dichroic mirrors, that is, R light, G light, and B light into liquid crystal devices at different incident angles to display a color image. It has been put to practical use.

In such a single plate type liquid crystal color projector, in order to prevent light from being effectively taken into each pixel in the single plate type liquid crystal device and to prevent a decrease in projection light amount due to black matrix shading, R in the single plate type liquid crystal device, It is known to use a microlens array (hereinafter referred to as MLA) in which one condensing microlens is associated with three G and B pixels to condense irradiation light to a desired pixel. There is.

FIG. 14 is a schematic configuration diagram of a time-division projection projector using a rotary color filter. This configuration includes a projection surface 91, a projection lens 92, a condenser lens 93, a reflective color image display device 94, a color filter 95, and a light source 96. The projection plane 91 is
It is a screen which projects the enlarged image. The projection lens 92 has a function of enlarging an image from the reflective color image display device and is composed of a plurality of lenses. The condenser lens 93 has a function of converting white light of the light source 96 into parallel light. Reflective color image display device 94
Is a structure in which the display element corresponds to each of the three primary colors by receiving light from a reflection plate (not shown) on the rear surface. As the color filter 95, filters of three primary colors of red (R), green (G), and blue (B) are rotated by a motor or the like. The light source 96 is a white light source, and a high pressure mercury type short arc lamp is used. The reflective color image display device 94 is obliquely illuminated.

In the operation of this conventional example, the white light from the light source 96 hits the color filter 95 rotating at a constant speed, and the color is selected by the filter. For example, in the case of a red (R) filter, only red is selected from white light, and the light reflected by the reflection plate in the reflection type color image display device 94 is emitted from the light source 96 according to ON / OFF of the display element. The light is emitted at the same angle as the incident angle, enlarged by the projection lens 92 arranged on the locus of the emitted light, and projected on the projection surface 91. This operation is performed in a time division manner, and a color image is projected.

Further, in place of existing color filters using dyes and pigments, color filters utilizing the spectral diffraction characteristics of holograms and diffraction gratings (hereinafter referred to as HCF; Holographi).
A full-color liquid crystal image display device using a c color filter) is known, and Japanese Patent Application Laid-Open No. 5-232319 discloses a technique relating to improvement of a liquid crystal video projector among liquid crystal image display devices.

According to this, each color cell of the color filter itself is constituted by a hologram, and a hologram panel (HCF) comprising holograms of minute dots corresponding to respective colors of red, green and blue is provided. A slit provided with a light-transmitting portion is arranged so that each diffracted light corresponding to each color of is condensed, and the light passing through the slit is imaged as red, green, and blue dots on the screen. It is a liquid crystal video projector.

[0008]

In recent years, with the development of personal computers (PCs), recognition of images has changed significantly, and it is impossible to speak without the images in the field of communication. In particular, recently, it has become common to create a document by a PC, form the document on a liquid crystal surface and directly project it on a projector to give a presentation, or to enjoy a liquid crystal television image on a large projector. In such a situation, the projection contents are not limited to characters, but rather there are more opportunities to handle images, so the demand for image quality has inevitably increased.

In FIG. 14 of the conventional example, each of the color separated images of the three primary colors of the color image to be projected is displayed on one panel-shaped liquid crystal device, and the primary color lights corresponding to these are emitted to illuminate each panel. A color image is displayed by synthetically projecting the primary color light image on the screen. further,
The color filter for obtaining the above primary color light has a complicated rotation mechanism, and since each color is time-division, the light intensity of the primary color light that illuminates each liquid crystal device is ⅓, and the projected color image is There was a problem of getting dark.

Also, in the case of a hologram, since the chief ray is obliquely incident, the light utilization efficiency is low and the color mixing ratio is poor. Further, there is a drawback that the angle dependence of incident light is very weak.

In view of the above-mentioned drawbacks of the prior art, the present invention is capable of condensing and reflecting the incident light from the light source without any loss even if the incident light is obliquely incident, and is an image display having an optical system which is compact and has high light quantity efficiency. To provide a device.

[0012]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to an image display apparatus, in which color separation is performed such that light from a white light source is color-separated and reflected at a constant angle. Optical means for receiving and condensing each color from the color separating means, a reflection type spatial modulation element for spatially modulating the light flux condensed by the optical means while reflecting the luminous flux on the reflecting plate, and the reflection In an image display device provided with a projection lens for projecting reflected light from a die spatial modulation element, the optical means has one convex lens portion on the transmissive spatial modulation element side and the other convex lens portion on the color separation means side. A bi-convex lens system, wherein the focal position of the one convex lens portion is arranged substantially on the surface of the other convex lens, and the first incident light, which is parallel light from the color separating means, passes through the focal position. Incident chief ray and the The second incident light that is incident in parallel with the light beam is configured to be condensed in an effective predetermined range on the reflective spatial modulation element side, and the reflective spatial modulation element is arranged corresponding to a pixel and A plurality of reflectors configured so that the reflection angle can be changed appropriately, and reflector driving means for driving the reflectors are provided, and the reflectors are individually selected according to pixel information, and necessary pixels are provided on the projection lens side. It is characterized in that it is configured to be reflective.

Here, the present invention has a biconvex lens system, but not only one convex lens, but also a plurality of convex lenses or concave lenses between one convex lens portion and the other convex lens portion, or a combination thereof. May intervene.

According to the present invention, since the focal position of the one convex lens portion is arranged substantially on the surface of the other convex lens portion, as long as the light incident from the color separating means passes through the focal position. Emits its chief ray as a parallel ray on the exit side. The second incident light that has entered the surface of the other convex lens portion in parallel with the principal ray is condensed at the image-side focal position of the biconvex lens system because of the one convex lens portion. Further, the first incident light, which is parallel light from the color separation means and is incident on the other convex lens surface, is condensed at a focal position on the reflective spatial modulation element side of the biconvex lens system. Therefore, it is possible to collect almost all of the incident light incident from the color separation unit on the reflective spatial light modulator side,
Since the condensed light is reflected by the reflector through the reflection type spatial modulation element to the projection lens side, an image display device having a bright reflection type spatial modulation element with reduced light loss is provided. can do.

That is, as the reflective spatial light modulator,
DMD (digital m
By using the icromirror device), the reflected light is reflected to the projection lens side while making use of the characteristics of the lens array of the present invention when ON, and the necessary pixels can be projected.
At F, the reflected light is reflected to the outside of the projection lens.

According to this invention, since white light is color-separated by the dichroic mirror, each color is individually incident on the liquid crystal element, so that a color filter is not required and the light utilization efficiency is improved. Further, even if light is obliquely incident on the pixel array, the divergent angle can be made small because the emitted light is parallel, and even when a projection lens having a small aperture is used, the entire luminous flux can be effectively used. . As a result, it is possible to obtain a color image with high light utilization efficiency and good white balance, and it is not necessary to use an expensive lens with a large aperture, which was a cause of cost increase. It is possible to avoid an increase in the cost of the liquid crystal display device as a whole.

Further, in the biconvex lens system used for the lens array substrate, all the primary color light separated by the color separating means can enter the effective surface of the other convex lens portion facing the color separating means. It is desirable that the effective surface of the one convex lens portion facing the pixel layer side is capable of emitting light of all the primary colors and forms one pixel.
At that time, the first surface that exits the effective surface of the one convex lens portion
It is preferable that the color is condensed on the central portion of the effective surface and the other colors are condensed on the peripheral portion. If the other colors are multiple colors, the peripheral portion may be shared or the outer portion of the central portion may be divided on the ring.

Further, the reflection plate selected as the necessary pixel is changed in its reflection angle so that it can be reflected toward the projection lens side, and the incident light of the reflection plate is made incident on the projection lens. It is an effective means. That is, when the pixel is not displayed, in other words, when the pixel is OFF, the reflected light is reflected at the same angle as the incident light, so that the direction is configured to be out of the projection lens. Further, when it is ON, it is configured to enter the projection lens.

According to this invention, since the angle of the reflector is changed when the pixel is ON, the angle to the projection lens can be controlled so that the divergence angle of the light beam becomes narrow.
The optical system can be made compact.

Further, in the present invention, the reflection plate selected as the necessary pixel can be changed in a direction in which an incident angle with respect to the reflection plate is increased in order to prevent diffusion of reflected light of the necessary pixel. Is an effective means. According to this technical means, the reflected light becomes parallel to the light entering the optical axis facing the reflecting plate, and the divergence angle of the luminous flux becomes narrower, so that the optical system can be designed compactly.

Further, it is an effective means of the present invention to change the reflection angle of the reflection plate selected as the necessary pixel so that the reflection angle can be reflected toward the biconvex lens side facing the reflection plate. According to this invention, the reflected light flux becomes parallel to the principal ray, the spread of the light can be prevented, and the light can be guided to the projection lens without waste.

Further, in the image display device using the reflection type spatial modulation element, the reflection plate arranged on the back surface of the liquid crystal layer corresponding to the pixel reflects the light to the projection lens side through the reflection type spatial modulation element. It is characterized in that it is configured in.

According to such a technical means, the projection lens may be arranged on the locus of the reflected light modulated by the reflection type spatial modulation element, so that the degree of freedom in design is expanded and the design is facilitated. Further, the optical refraction and combining means such as a prism becomes unnecessary, and the cost of the optical system can be reduced.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the constituent elements, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples, not the gist of limiting the scope of the present invention thereto, unless otherwise specified. Absent.

FIG. 1 is a cross-sectional view of a reflection type color liquid crystal display element 10 with MLA used in the reflection type color liquid crystal display device of the present embodiment and a diagram showing a light locus. The reflective color liquid crystal display element 10 has a transparent scanning electrode 23 and driving electrodes 12R, 12G, and 12B formed on the opposing surfaces of an MLA substrate 20 and a glass substrate 11, respectively, and the liquid crystal layer 1 is interposed therebetween.
3 is filled and the periphery is sealed by the sealing material 14.

The MLA substrate 20 is formed by sandwiching three lens resin layers 18, 17 and 16 which are transparent and have different refractive indexes between the base glasses 19 and 15, and the lens resin layers 18, 17 and 16 are An interface is formed. The scan electrodes 23 and the drive electrodes 12R, 12G, 12B are orthogonal to each other and are formed of transparent electrodes. That is, the electrodes are arranged in a matrix, and when the intersections are selected, the liquid crystal layer 13 in the portion corresponding to the drive electrodes transmits light by phase transition. And drive electrodes 12R, 12G, 12
B is provided corresponding to the three primary colors of red (R), green (G), and blue (B), and all the colors are formed by combining the respective colors to drive one pixel of the liquid crystal.

Next, the trajectory of light will be described. The chief ray is shown by a broken line, and each color is represented by red (R), green (G), and blue (B). Hereinafter, the first lens portion 22 on which the incident light is incident means the (object side lens portion), and the second lens portion 21 on which the incident light is emitted means the (image side lens portion). As shown in the figure, the chief ray enters from the first lens portion 22, passes through the second lens portion 21, and enters perpendicularly to the drive electrodes 12R, 12G, and 12B. If there is a reflective film on the drive electrode side of the glass substrate 11, the reflected light passes through the same locus, and the first lens portion 22
It is designed to focus on P1 of the optical axis of. Further, the light flux of each color enters and is refracted from the first lens portion 22, is refracted again by the second lens portion 21, and is driven by the drive electrodes 12R, 12G, and 1.
The light is focused on 2B, reflected light is reflected at the same angle, passes through the second lens portion 21, and is further designed to be parallel to the incident light by the first lens portion 22.

FIG. 2 is a diagram for explaining the trajectory of the light in FIG. 1 in more detail. For example, the case of green (G) light will be described with reference to FIG. 2A. In this case, the principal ray passes the same locus as the broken line and the other rays are refracted by the first lens unit 22. Then, the light is further refracted by the second lens portion 21 and condensed on the drive electrode 12G. This is equivalently considered to be a lens having a combined focal length f1 of the first lens unit 22 and the second lens unit 21.

Similarly, FIG. 2B is a diagram for explaining the trajectory of the light in FIG. 1 in more detail. The chief rays of each color are
The incident rays are perpendicular to the drive electrodes 12R, 12G, and 12B, and the reflected light passes through the same locus, so that the principal rays of each color are parallel. The parallel light enters the second lens portion 21,
The focal length f2 is designed to match the optical axis of the first lens unit 22.

As described above, by using the lens array of this embodiment, it is possible to simultaneously inject light of each color obtained by separating the light from the white light into the three primary colors into one pixel of the liquid crystal. There is no loss of light due to division or color filters, and a bright optical system can be realized. Also,
Even if the incident light is obliquely incident, the light flux is incident on and condensed on the liquid crystal by the lens array of the present embodiment, so that the spots of light are aggregated and the leakage of light to adjacent pixels, that is, the so-called light color mixing rate is The drastically reduced luminous flux can be received by the liquid crystal surface. Furthermore, since the emitted light is in a certain direction,
The optical system can be designed accordingly, the optical system itself becomes compact, and the optical system can be easily designed.

FIG. 3 shows that the pixel of this embodiment is ON / OF.
It is a perspective view showing the ray trace in the case of DMD which moves mechanically in F. This figure shows a case where a light ray is obliquely incident from the vertical direction with respect to the array of pixels. DM on the left side of the figure
When D33 is OFF, the right side is when DMD33 is ON. First, when OFF, the incident light is MLA31 and ML
As explained in FIG. 1 by A32, the chief ray is DMD33.
Is collected at. At this time, the micromirrors of the DMD 33 are not tilted, so they are reflected at the same angle as the incident angle and do not enter the projection lens 30. Next, when it is ON, the micromirror of the DMD 33 is tilted at an angle of incidence on the projection lens 30 and an image is projected on a screen (not shown).

FIG. 4 is a diagram for explaining the movement of the DMD 33 of FIG. 3 in a more understandable manner. (A) is DM
When D33 is OFF, the light incident from below is reflected at the same angle and guides the light beam to the outside of the projection lens (not shown).
(B) shows the case where the DMD 33 is ON, and the light incident from below is incident on the projection lens (not shown) by the inclined micromirror. Thus, even if the incident light is oblique, the principal rays are condensed by the MLAs 31 and 32, and the DMD
The light is modulated by 33. In this case, it is important that the reflected light becomes horizontal and passes through one lens array when the DMD 33 is ON. Because,
This is because the characteristics of the lens array of this embodiment can be fully utilized.

FIG. 5 is a perspective view showing a ray trace in the case of a reflective color liquid crystal display element. This figure shows a case where a light ray is obliquely incident from the vertical direction with respect to the array of pixels. Portions equivalent to those in FIG. 3 are designated by the same reference numerals, and a duplicate description will be omitted. In this case, due to the phase transition of the liquid crystal layer of the liquid crystal display element according to the pixel information,
This is the principle of transmitting or non-transmitting the reflected light, and since the reflection angle is uniquely determined, the projection lens may be set on the locus of the reflected light modulated by the reflective color liquid crystal display element 40.

FIG. 6 is a diagram for explaining the movement of FIG. 5 in a more understandable manner. Incident light is made incident on the two lenses and reflected at the same angle as the incident light.
The reflected light is emitted in parallel with the chief ray. Therefore, if the projection lens is set on the locus of the reflected light modulated by the reflective color liquid crystal display element 40, the light flux can be projected without waste.

FIG. 7 shows a case where a light ray is obliquely incident on the arrangement of pixels of the DMD 33. (A) is DM
When D33 is OFF, the three primary color lights that are obliquely incident are reflected at the same angle and guide the light beam to the outside of the projection lens (not shown). (B) shows the case where the DMD 33 is ON, and the light obliquely incident is reflected by a tilted micromirror to a projection lens (not shown). Here, all of R, G, and B are turned on, but in reality, they are individually turned on / off.
Also in this case, the reflected light becomes horizontal as in FIG.
It is important that the light passes through the two lens arrays.

FIG. 8 is a perspective view showing a ray trace in the case of a reflective color liquid crystal display device. This figure shows a case where a light ray is incident obliquely with respect to the arrangement of pixels. This is basically the same as in the case of FIG. 6, the incident light is made to enter across two lenses and is reflected at the same angle as the incident light. The chief ray is condensed on the optical axis of the lens array 31,
The luminous flux of the reflected light is emitted in parallel. Therefore, if the projection lens is set on the locus of the reflected light modulated by the reflective color liquid crystal display element 40, the light flux can be projected without waste.

FIG. 9 shows a case where the DMD is used and the light is obliquely incident from the direction perpendicular to the pixel arrangement, and three light rays are used. (A) is when the DMD 33 is OFF, and when incident light from an oblique direction enters over one lens, naturally reflected light is transmitted through the third lens surface 31 of the lens surfaces of the incident light. In (b), when the DMD 33 is ON, the reflected light is reflected toward the lens facing the mirror. That is, a unit of one of the three primary colors is a lens array having three lenses. According to such an embodiment, since the locus of light is determined at the time of designing, the thickness of the entire optical system can be controlled and designing becomes easy. Further, since the width of the lens thickness with respect to the pixel increases, it is advantageous for color mixing.

FIG. 10 is a diagram showing ray trajectories in the case of a reflective color liquid crystal display element. In this case, the principle is that the reflected light is transmitted or non-transmitted by the phase transition of the liquid crystal layer of the liquid crystal display element according to the pixel information, and the reflection angle is uniquely determined. It is designed to contain the ray trajectories within.

FIG. 11A shows the first embodiment,
FIG. 11 is a schematic diagram showing the configuration of a reflective color display device using a DMD, and FIG.
11A is an enlarged view of part A of FIG.
FIG. 11C is an enlarged view of part A in FIG. 11A when the micromirror 71 is in the ON state. In addition, FIG. 12 shows DM
11 is a perspective view illustrating a pixel structure of one pixel of the D device 800, that is, one color of three primary colors. FIG. In this embodiment, a DMD 80 that mechanically moves pixels ON / OFF is used as a reflection type spatial modulation element, so that the reflected light when ON is used on the projection lens side while utilizing the characteristics of the lens array of this embodiment. The necessary pixels can be projected and the reflected light is reflected to the outside of the projection lens when turned off. First, the DMD 80 will be described. This is because the Si substrate 73
It is an optical element in which a large number of fine micromirrors 71 are arranged on the top. A pair of supporting portions 72 is provided on the upper surface of the Si substrate 73.
Is provided, and both ends of the torsion hinge 76 are supported by the support portion 75 on the surface of the Si substrate 73.

A central portion of a yoke 74 is attached to the torsion hinge 76, and a micro mirror 71 is formed on the upper end of a pillar portion 70 standing upright at the center of the yoke 74. The angle of the micro mirror 71 is controlled by adjusting the inclination of the yoke 74 while twisting the torsion hinge 76 by applying a driving force to the yoke on the upper surface of the Si substrate 73 by an electromagnetic force such as static electricity. A mirror driving means is provided for this purpose. Thus the yoke 74
The angle of the micro mirror 71 can be changed by inclining, and when the micro mirror 71 is irradiated with light, the direction of reflected light can be freely controlled.

As shown in FIG. 11, the reflection type color display device using the DMD 80 has the MLA substrate 20 arranged so as to face the DMD device 800, and white light emitted from the light source 63 is dichroic mirror (color separation element). ) 64 disperses the light into red, green, and blue light beams, and separates the light beams of each color from diagonally to M
By transmitting the light through the LA substrate 20, the three DMDs 80 forming the three primary colors of color are irradiated. In each pixel, the light flux that does not need to be displayed on the screen 60 is reflected in the lateral direction by the micro mirror 71 and absorbed by the light absorber 62, and when displayed on the screen, is directed by the micro mirror 71 toward the projection lens 61. It is reflected and imaged on the screen 60 by the projection lens 61,
It becomes one pixel of the color display image. At this time, of course, as described with reference to FIGS. 4 and 7, the light flux passes parallel to the MLA. Further, in order to display the gradation, the mirror is controlled so that the light is projected on the screen for a time that is time-divided according to the gradation level during one frame period. For example, with 256 gradations, 1 frame time (60 frames is 1/60 seconds)
The mirror is controlled at intervals of 1/256.

When the MLA substrate 20 having the biconvex lens structure is used in the reflection type color display device using the DMD 80, the principal rays of the luminous flux of each color are emitted so as to be parallel between the MLA substrate 20 and the DMD 80. Therefore, it becomes easy to control the light. Moreover, if the MLA substrate 20 described above is used, as a result, the optical characteristics can be improved, so that the quality of the reflective color display device is improved and the cost can be reduced.

Furthermore, the MLA substrate of this embodiment is
As a field of application of the image display device, a projection type projector,
It can also be used for a rear projection type projector TV (rear professional TV), a head-mounted display (HMD; an eyeglass-type display monitor used in recent personal amusements and the like), a viewfinder, a mobile phone, and the like.

FIG. 13 is an overall structural view of a reflective color liquid crystal display device according to the second embodiment. In this reflective color liquid crystal display device, a spherical mirror (not shown) is provided behind the white light source 56, and the spherical mirror is arranged so that the center thereof coincides with the center of the light emitting portion of the white light source 56. A condenser lens 57 is provided on the front surface of the white light source 56, and the condenser lens 57 is arranged so that its focal point coincides with the center of the light emitting portion of the white light source 56. Then, the white light flux W emitted from the white light source 56 or the white light flux W emitted from the white light source 56 and reflected by the spherical mirror becomes a substantially parallel white light flux W by passing through the condenser lens 57.

In front of the condenser lens 57, three types of dichroic mirrors 55R, 55G and 55B are arranged at different angles. The dichroic mirrors 55R, 55G, and 55B have a property of selectively reflecting light in each wavelength range corresponding to red, green, and blue colors, and transmitting the other, and are arranged on the optical axis in this order. There is. Less than,
The symbols R, G, and B represent red, green, and blue colors, respectively.

The wavelength ranges of blue, green and red are 400 respectively.
-495 nm, about 495-575 nm, about 570-70
The wavelength range of 0 nm is shown. However, if all the light in each of these wavelength ranges is used, the screen illuminance will be high, but the color purity of each primary color will be reduced.
In some cases, the light near 495 nm and the light near 575 nm are cut off.

Dichroic mirrors 55R, 55G, 5
5B is formed by a well-known multilayer thin film coating technique. The red dichroic mirror 55R is about 600 nm
The conditions of the multilayer thin film are set so that visible light of longer wavelength is reflected, and the blue dichroic mirror 55B has about 500
The condition of the multilayer reflective film is set so as to reflect visible light having a wavelength shorter than nm, and the condition of the multilayer thin film is set so that the green dichroic mirror 55G reflects visible light in the range of about 570 nm-500 nm. . Further, if any of the dichroic mirrors 55R, 55G and 55B is designed to transmit infrared rays, the infrared rays can be transmitted through the liquid crystal display element 54.
Therefore, it is effective to reduce the temperature rise of the liquid crystal display element 54.

In this way, the parallel white light flux W transmitted through the condenser lens 57 is converted into the dichroic mirror 5.
5R, 55G, 55B are incident on the red light flux, the green light flux,
It is decomposed into a blue light flux and obliquely enters the MLA 20 provided in the liquid crystal display element 54. The MLA 20 is the lens array of the present embodiment, and as described above, by using the biconvex lens, even if the light is obliquely incident within a certain angle range, the principal ray is vertically incident on each pixel, and By condensing the light, it is possible to realize an optical system that emits the light within the effective range. Therefore, the emitted light is enlarged by the projection lens 51 and projected on the screen 50.

[0049]

As described above, according to the present invention, the image display device makes the principal ray parallel between the MLA substrate and the DMD even when light is obliquely incident from the vertical direction or the horizontal direction of the pixel arrangement. It is possible to reduce the light loss and provide a bright image display device.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a reflective color liquid crystal display element with MLA used in the reflective color liquid crystal display device according to the present embodiment.

FIG. 2 is a diagram for explaining the trajectory of light in FIG. 1 in more detail.

FIG. 3 is a perspective view showing a ray trace in the case of a DMD in which pixels are mechanically moved by ON / OFF.

FIG. 4 is a diagram for explaining the movement of the DMD in FIG. 3 in a more understandable manner.

FIG. 5 is a perspective view showing a trajectory of light rays in the case of a reflective color liquid crystal display element.

FIG. 6 is a diagram for explaining the movement of FIG. 5 in a more understandable manner.

FIG. 7 is a diagram when a light ray is obliquely incident on a DMD pixel array.

FIG. 8 is a perspective view showing a trajectory of light rays in the case of a reflective color liquid crystal display element.

FIG. 9 is a diagram showing a case where light rays use three lenses when obliquely incident from a direction perpendicular to a pixel arrangement when a DMD is used.

FIG. 10 is a diagram showing a ray trace in the case of a reflective color liquid crystal display element.

FIG. 11 is a schematic diagram showing a configuration of a reflective color display device using a DMD according to the first embodiment.

FIG. 12 is a perspective view illustrating a pixel structure for one color of three primary colors of DMD.

FIG. 13 is an overall structural diagram of a reflective color liquid crystal display device according to a second embodiment.

FIG. 14 is a schematic configuration diagram of a time-division projection projector using a conventional rotary color filter.

[Explanation of symbols]

20 Microlens array substrate 21, 22 Micro lens array (MLA) 60 screen 61 projection lens 62 Optical absorber 63 light source 64 dichroic mirror 70 Pillar 71 Micro Mirror (Reflector) 72, 75 support 73 Si substrate 74 York 76 torsion hinge 80 DMD (Reflective spatial modulator)

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) G03B 21/00 G03B 21/00 F 33/12 33/12 (72) Inventor Daido Uchida Tohorigawa Higashiiri, Shiojikoji, Shimogyo-ku, Kyoto Minami-Fudo-cho 801 Omron Co., Ltd. (72) Inventor Yasuhiro Kawabata Shiori-Koji Shimokoji-dori Horikawa Higashiiri Minami-Fudo-cho 801 Omron Co., Ltd. F-term (reference) 2H088 EA13 EA15 EA16 HA13 HA21 HA24 HA28 MA06 2H091 FA05X FA14Z FA26X FA29X FA41X FD01 LA03 LA11

Claims (5)

[Claims] 1. An optical means comprising: a color separation means arranged so as to color-separate light from a white light source and reflect the light at a constant angle; and an optical means for receiving and condensing each color from the color separation means. An image display device comprising: a reflective spatial modulation element that spatially modulates a light beam condensed by an optical means while reflecting it by a reflection plate; and a projection lens that projects reflected light from the reflective spatial modulation element, wherein: The means includes a biconvex lens system in which one convex lens portion is arranged on the reflective spatial modulation element side and the other convex lens portion is arranged on the color separation means side, and the focal position of the one convex lens portion is substantially the surface of the other convex lens surface. The first incident light, which is arranged on the upper side and is parallel light from the color separation means, and the principal ray incident through the focal position and the second incident light incident in parallel with the principal ray are both the reflection type space. Effective predetermined range on modulator side A plurality of reflectors arranged so as to collect light, wherein the reflection-type spatial modulation element is arranged so as to correspond to pixels and is capable of appropriately changing a reflection angle of incident light, and a reflector driving means for driving the reflectors. An image display device comprising: and a reflection plate that is individually selected according to pixel information so that necessary pixels can be reflected to the projection lens side. 2. The reflection plate selected as the necessary pixel is changed in its reflection angle so that it can be reflected toward the projection lens side, and makes the incident light of the reflection plate incident on the projection lens. The image display device according to claim 1. 3. The reflection plate selected as the necessary pixel, in order to prevent diffusion of reflected light of the necessary pixel,
The image display device according to claim 2, wherein the angle of incidence on the reflection plate can be changed in a direction in which the angle of incidence is increased. 4. The image display device according to claim 3, wherein the reflection plate selected as the necessary pixel is changed in reflection angle so that the reflection angle can be reflected toward the biconvex lens side facing the reflection plate. . 5. The reflection type spatial modulation element is configured to reflect to the projection lens side through the reflection type spatial modulation element by the reflection plate arranged corresponding to pixels on the back surface of the liquid crystal layer. The image display device according to claim 1, wherein the image display device is a display device.